C++重载运算符

#include<iostream>
using namespace std;
class Byte{
    public:
        Byte(){b=0;}
        Byte(int k){b=k;}
    const Byte operator+(const Byte& right)const{
        return Byte(b+right.b);
    }
    const Byte operator-(const Byte& right)const{
        return Byte(b-right.b);
    }
    const Byte operator*(const Byte& right)const{
        return Byte(b*right.b);
    }

    Byte& operator+=(const Byte& right){
        b+=right.b;
        return *this; 
    }
    
    bool operator ==(const Byte& right)const{
        return b==right.b;    
    }
    int getnum(){
        return b;
    }
    private:
        int b;
};
int main(){
    Byte test(3),k(3),haha;
    if(test==k)
    cout<<"true"<<endl;

Byte test(3),k(2),haha;
test+=k;
cout<<test.getnum()<endl;

return 0;
}